Brand: Dakota NDT

Dakota ZX6-DL Corrosion Thickness Gauge

Name: Dakota ZX6-DL Corrosion Thickness Gauge – Datasheet & Quote
Brand: Dakota NDT

Description

Overview

The Dakota ZX6-DL is a multi-echo, through-paint ultrasonic thickness gauge with onboard data logging, designed specifically for measuring base-metal wall thickness without removing protective coatings first. It is used by inspection contractors, maintenance teams, and asset owners across Oman and the GCC who need reliable thickness readings on coated pipework, tanks, and structural steel without the time and cost of coating removal.

The ZX6-DL builds on the ZX5-DL’s data-logging platform but adds an Echo-Echo measurement mode, making it the choice within the Dakota ZX family specifically for painted or coated assets rather than bare metal.

Operating Principle

In standard pulse-echo mode, the ZX6-DL measures like other ZX-series gauges, timing the return of a sound pulse from the back wall. Its key differentiator is Echo-Echo (E-E) mode, which measures the interval between two successive back-wall echoes rather than from the front surface — this makes the reading independent of the coating layer, so the gauge reports true base-metal thickness while the coating (0.001 to 0.075 inches) is effectively ignored. The instrument uses a 120 MHz FPGA timing circuit with automatic V-path and dual-path error correction to maintain accuracy across both measurement modes.

Engineering Design of the Dakota ZX6-DL

The ZX6-DL covers a pulse-echo measurement range of 0.025 to 36 inches (0.63 to 914.4 mm) at 0.001 inch (0.01 mm) resolution, and in Echo-Echo mode measures base metal from 0.1 to 6 inches through coatings from 0.001 to 0.075 inches thick. Like the ZX5-DL, it includes onboard data logging with capacity for 10,000 sequential readings organized into 40 files of 250, downloadable via USB. Its dual-element transducer (1 to 10 MHz) pairs with a multi-function 4.5-digit, 7-segment LCD refreshing at 10 Hz, giving a smooth, responsive readout whether scanning bare or coated surfaces.

Key Features

Echo-Echo (E-E) through-paint measurement mode — no coating removal required
Pulse-echo range 0.025-36 in (0.63-914.4 mm); Echo-Echo base metal 0.1-6 in through 0.001-0.075 in coating
Resolution 0.001 in (0.01 mm)
Onboard data logging: 10,000 readings (40 files × 250), USB download
Dual-element transducer, 1-10 MHz
120 MHz FPGA timing with automatic V-path/dual-path error correction
Multi-function 4.5-digit LCD, 10 Hz refresh rate

Industrial Applications

Across Muscat, Sohar, and Salalah, the ZX6-DL is used for corrosion-under-coating surveys on painted pipework, tank shells, and structural steel in refineries, petrochemical plants, and marine facilities — environments where coatings are applied for corrosion protection and removing them for every inspection point is impractical. The through-paint capability significantly reduces inspection downtime and avoids damaging protective coating systems during routine wall-thickness surveys.

The gauge is also well suited to shipyard and offshore structure inspection, where hull and structural coatings are standard, and to plant turnaround inspections where large numbers of coated measurement points must be surveyed quickly without a coating-removal step.

Technical Specifications

Parameter	Specification
Measurement Modes	Pulse-Echo and Echo-Echo (through-coating)
Pulse-Echo Range	0.025-36 in (0.63-914.4 mm)
Echo-Echo Range	Base metal 0.1-6 in through 0.001-0.075 in coating
Resolution	0.001 in (0.01 mm)
Transducer	Dual-element, 1-10 MHz
Timing Circuit	120 MHz FPGA, automatic V-path/dual-path correction
Data Logging	10,000 readings (40 files × 250), USB download
Display	4.5-digit multi-function LCD, 10 Hz refresh

When to Use Echo-Echo Mode

The main reason to specify the ZX6-DL is the ability to read steel thickness through intact paint. Echo-Echo mode is the right choice when the coating is in good condition and within the thickness range stated in the specification table, and when the base metal falls within the Echo-Echo range. Standard pulse-echo mode remains the better option on bare metal, on very thin sections, and where heavy internal pitting weakens the second back-wall echo.

Use Echo-Echo on painted piping, tank shells and structural members in good coating condition.
Switch to pulse-echo on uncoated areas, weld caps ground flush, or where only one clean back-wall echo is available.
Where coatings are thicker than the stated limit, or damaged, remove the coating locally at the test point.

Calibration and Setup

Zero the transducer, then set the sound velocity for the base metal using a known-thickness reference block. For through-coating work, confirm the setup on a painted sample of known steel thickness wherever possible, because this checks that the gauge is picking up two clean back-wall echoes rather than a coating interface. Record the measurement mode for each file, so that later reviewers know whether a value came from pulse-echo or Echo-Echo, since that affects how coating thickness is treated in the result.

Data Logging Workflow

Build files around inspection routes, such as one file per pipe rack or tank course, and store readings in the same order as the drawing or isometric. Download via USB after each shift and archive the data with the calibration record, so the Dakota ZX6-DL survey can be repeated at the same points on the next inspection cycle for accurate corrosion-rate calculation.

Troubleshooting

No reading in Echo-Echo mode: the coating may be too thick, poorly bonded, or the far wall too corroded to return a second echo. Try pulse-echo at a cleaned point.
Readings higher than expected: check that the correct mode is active, as pulse-echo includes the coating in the measured value.
Unstable display on curved pipe: use more couplant, a smaller probe and steady contact pressure.

Why It Suits Oman and the GCC

Coating systems on coastal plants and offshore structures in the region are expensive to repair after inspection. Measuring through paint avoids creating fresh bare spots that would otherwise rust quickly in humid, salty conditions, and it shortens turnaround survey time considerably on large coated assets.

Complete Inspection Kits

Seven Star LLC can supply the gauge with compatible dual-element transducers, cables, couplant and step blocks, and can advise whether the ZX5-DL or ZX6-DL better suits your mix of bare and coated assets.

Also available: Dakota Dual Element Transducers for Corrosion Thickness Gauges

Request a Quote for Dakota ZX6-DL Corrosion Thickness Gauge

Seven Star LLC is the official authorized representative of Dakota NDT in Oman, supplying through-paint thickness gauges with technical support for inspection teams across Oman and the GCC. Contact our engineering team for a formal quotation and guidance on Echo-Echo setup for coated-asset inspection programs.

See also: Dakota BT1-DL Bolt Tension Monitor.

Datasheets & Documents

Datasheet Dakota ZX6-DL Corrosion Thickness Gauge Datasheet Download
Instruction Manual Dakota ZX6-DL Thickness Gauge (ZX-6DL) Instruction Manual Download
Datasheet Dakota ZX6-DL Thickness Gauge Datasheet Download

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About brand

Ultrasonic thickness gauging is the core of Dakota NDT, the Scotts Valley, USA maker that many inspectors still know as Dakota Ultrasonics. Its instruments measure remaining wall on corroded pipe and vessels, check precision parts, find flaws in welds and monitor bolt elongation.

Seven Star LLC is the Dakota NDT agency for Oman and the GCC. We list Dakota corrosion and precision thickness gauges, flaw detectors, transducers, delay line tips and calibration blocks, and supply them with the manufacturer's documentation.

Dakota NDT product families

Corrosion thickness gauges form the largest group: the CMX10-DL with full waveform capture, the CMX, CX and ZX series and the MX2-DL. For thin or tight-tolerance material Dakota builds the precision line, made up of the PZX1-DL, the PCX8-DL and the PMX series. The RX8-DL sonic tester, the PMX4-DL and the R9 sit in the specialty group. Flaw detection is handled by the handheld FX71-DL and the bench-top FX81-DL, and bolt tension by the BT1-DL, the BT2-DL and the MultiMax remote monitoring system. Dual element transducers pair with corrosion gauges, single element and delay line probes with precision gauges. DakMaster and DakView software take care of data transfer and reporting.

Where Dakota ultrasonic thickness gauges are used

Typical jobs are wall-loss surveys on pipelines, tanks, boiler tubes and pressure vessels in oil and gas plants and power stations, thickness checks on machined, drawn or molded parts, weld inspection in fabrication shops, and bolted joints on flanges and turbines where clamp load matters more than torque.

Ordering Dakota gauges and probes: what we need

A useful inquiry names the gauge model, the material, its expected thickness span, the surface temperature and whether the surface is coated. For transducers send the frequency, element diameter, connector type and the gauge the probe will be used with. For calibration blocks give the material and the step sizes you need. If you already own a Dakota instrument, a photo of its label and of the current probe lets us check the match against the manufacturer's documentation.

FAQ

Questions about the Dakota ZX6-DL Corrosion Thickness Gauge

Answers from our engineering team on installation, compatibility and integration.

01What makes the ZX6-DL different from other ZX series models?

The ZX6-DL offers enhanced measurement control, improved signal stability, and built-in data logging for professional inspection applications.

02Does the ZX6-DL support data storage for inspection records?

Yes, it includes internal memory for storing thickness measurements during inspections.

03What materials can be measured with the ZX6-DL?

It is primarily designed for steel and other common industrial metals used in pipelines, vessels, and structural components.

04Is the ZX6-DL suitable for harsh industrial environments?

Yes, its rugged aluminum housing and stable electronics are designed for demanding field conditions.

05Who should use the ZX6-DL?

The ZX6-DL is intended for professional inspectors, maintenance engineers, and NDT personnel performing advanced corrosion monitoring and asset integrity inspections.